The **3AP300-R** is a specific electronic component, most commonly identified as a **tactile switch** (or tact switch) manufactured by companies like **CIT Relay & Switch**. It is a momentary pushbutton switch designed for mounting on printed circuit boards (PCBs). --- ### 1. Technical Specifications The following table outlines the typical electrical and mechanical characteristics of the 3AP300-R series: | Feature | Specification | | :--- | :--- | | **Switch Type** | Momentary Tactile Switch | | **Contact Arrangement** | SPST (Single Pole, Single Throw) | | **Contact Rating** | 50mA @ 12VDC | | **Actuation Force** | 300 ± 50gf (Gram-force) | | **Travel** | 0.25mm ± 0.1mm | | **Contact Resistance** | < 100mΩ (Initial) | | **Insulation Resistance** | > 100MΩ @ 100VDC | | **Dielectric Strength** | 250VAC for 1 minute | | **Operating Life** | ~100,000 cycles | --- ### 2. Physical Design The "3AP" series typically refers to a specific form factor: * **Mounting Style:** Through-hole (P-style usually indicates PC pin termination). * **Actuator Height:** The "300" often correlates to the actuation force (300gf), while the physical height can vary depending on the specific suffix, though it is generally a standard square body (approx. 6mm x 6mm). * **Cap Options:** It can be used with or without an external square or round cap. ### 3. Key Components & Materials * **Housing:** High-temperature thermoplastic (usually UL94V-0 rated) to withstand soldering. * **Actuator:** Thermoplastic (Silicon or hard plastic depending on the specific sub-model). * **Contact Dome:** Stainless steel with silver plating to ensure high conductivity and a crisp "click" feel. * **Terminals:** Brass or Copper alloy with silver or gold plating to prevent oxidation. ### 4. Common Applications Due to its high actuation force (300gf), which provides strong tactile feedback, this part is used in: * **Industrial Controls:** Panel buttons that require a deliberate press. * **Consumer Electronics:** Home appliances (microwaves, washing machines). * **Telecommunications:** Network hardware reset buttons. * **Medical Equipment:** Interface panels where reliability is critical. --- ### 5. Part Number Breakdown (Generic) | Code | Meaning | | :--- | :--- | | **3A** | Series identifier (6mm Tact Switch) | | **P** | Terminal type (PC Pin / Through-hole) | | **300** | Actuation Force (300 grams) | | **-R** | RoHS Compliant / Tape & Reel or specific variation |